Battery Pack Controller for Excess Discharge Detection
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Solution Overview
Problem
Hybrid vehicle battery packs face the challenge of excess discharge during engine startup, leading to irreversible battery deterioration due to the high power demand from the electric motor, which existing detection methods fail to accurately and efficiently address.
Innovation Solution
A battery pack controller with a specific battery detection mechanism that continuously measures voltage across individual batteries, identifies those in an excess discharge state, and controls power supply to prevent further discharge below a threshold voltage, thereby preventing irreversible deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage detection is performed on all batteries in the battery pack, then detection coverage is improved, but detection speed and responsiveness to excess discharge deteriorate due to the time required to scan all batteries
Solution Approach 1:
The battery pack is divided into multiple groups, with designated group batteries in each group that are monitored for voltage changes. Instead of uniformly detecting all batteries, the system segments the monitoring task to focus on representative batteries that indicate the state of the entire group, thereby reducing detection time while maintaining effective monitoring coverage.
Solution Approach 2:
The system preliminarily identifies and designates specific group batteries before excess discharge occurs. By pre-selecting which batteries to monitor based on their position and characteristics in the battery pack, the system prepares the detection targets in advance, enabling rapid response when excess discharge conditions arise without needing to scan all batteries.
2Reliability
If continuous voltage monitoring of all batteries is implemented, then excess discharge detection accuracy is improved, but power consumption and system complexity increase
Solution Approach 1:
The detection system is segmented to monitor only specific group batteries rather than all batteries continuously. This reduces the number of detection circuits and processing requirements while maintaining reliable detection of excess discharge conditions through strategic selection of representative batteries that reflect the overall battery pack state.
Solution Approach 2:
The detected voltage changes in group batteries serve multiple functions: they indicate excess discharge conditions, identify affected batteries, and trigger appropriate control responses. By making the group battery detection system multi-functional, the patent reduces overall system complexity while maintaining comprehensive monitoring capabilities.
3Power
If high power is supplied to the electric motor for engine startup, then startup performance is improved, but the risk of excess discharge and battery deterioration increases
Solution Approach 1:
The system continuously monitors voltage changes in group batteries and uses this feedback to detect excess discharge conditions. When voltage drops indicate excess discharge, the system provides feedback to the power supply control to adjust power output, thereby protecting battery durability while maintaining startup performance within safe operating limits.
Solution Approach 2:
The system takes preliminary anti-action by detecting excess discharge conditions through voltage monitoring before irreversible battery deterioration occurs. By identifying at-risk batteries in advance and controlling power supply accordingly, the system prevents harmful effects while allowing high power delivery for engine startup when conditions are safe.
Data Source
AI summary
The invention provides a specific battery detection means that specifies single batteries believed to be in an excess discharge state during operation of the electric motor for starting the engine, based on data for each battery pack detected prior to starting the engine. With the specific battery detection means, a change in voltage for specific single batteries is measured for a drop in voltage of a single battery by the discharge via the voltage detection means. The specific battery detection means is configured such that if the results of this measurement are outside a predetermined threshold value, the power supplied to the electric motor for starting the engine is limited.